function test_1() {
    if (1) {
        console.log("1 -> true"); //1 is true
    } else {
        console.log("1 -> false");
    }

    let a;
    if (a) {
        console.log(`${a} is true`);
    } else {
        console.log(`${a} is false`); //undefined is false
    }

    const b = null;
    if (b) {
        console.log(`${b} is true`);
    } else {
        console.log(`${b} is false`); //null is false
    }
}

export function test_null() {
    console.log("===>Test: test_null()");
    test_1();
}
